Tsvangirai spoke to reporters as he arrived at a Harare hotel for a second day of talks mediated by former South African president Thabo Mbeki, aimed at reviving the faltering accord on forming a unity government.
Asked if an agreement would be reached on Wednesday, Tsvangirai said: "Let’s hope. We are still negotiating."
Mbeki brokered the original deal calling for 84-year-old Mugabe to remain as president while Tsvangirai takes the new post of prime minister.
But the deal has floundered over disputes on how to divide cabinet posts, with Tsvangirai threatening to pull out after Mugabe announced last weekend that he would give his own party the most important portfolios.